Backflow Preventer Calculator
Determine the correct backflow prevention device type, size, pressure loss, and estimated installation cost based on hazard level.
Inputs
GPM
psi
inches
Results
Recommended Device
3 (1=AVB, 2=PVB, 3=DCVA, 4=RPBA)
Minimum Device Size
2 inches
Total Pressure Loss11 psi
Estimated Install Cost$1,049
How to Use This Calculator
- Enter the system flow rate in GPM to size the backflow preventer.
- Set the hazard level: 1 = low (irrigation), 2 = medium (chemical boilers), 3 = high (toxic connections).
- Enter your supply pipe size to match the device connection diameter.
- Review the Recommended Device type — high-hazard applications require a Reduced Pressure Zone (RPZ) assembly.
- Use the Estimated Install Cost to budget for device purchase and licensed installation.
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